Cummins/Onan 3100 series — Testing the Exciter Stator
Testing & diagnosis
For the Cummins/Onan 3100 series, from the Cummins/Onan service manual.
Applies to: Cummins/Onan GGKD
Procedure
- Measure winding resistance with a Wheatstone bridge or digital ohmmeter.
- Replace the stator if winding resistance is not as specified in Table 6-1.
- Disconnect the exciter stator leads from terminals X and XX.
- Measure resistance between either lead and the stator laminations.
- Replace the stator if insulation resistance is less than 1 megohm (1,000,000 ohms).
Tools required
- Wheatstone bridge or digital ohmmeter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Insulation resistance must be at least 1 megohm
Full service-parts list: Cummins/Onan GGKD →
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.